The Sac & Fox Nation, a tribal nation in Oklahoma, announced Tuesday that it would close two of its casinos after an employee tested positive for coronavirus. According to the local NBC affiliate, the tribe will close the Black Hawk Casino in Shawnee and the Sac and Fox Casino in Stroud for an undetermined amount of time.

A statement from the tribe said that the closure is being implemented “out of an abundance of caution.” While business is closed, both properties will undergo deep cleaning procedures and the entire gaming area will be disinfected.

Last Thursday, Gila River Gaming closed three Arizona casinos after a 68-year-old security guard passed away from the virus.